作者:Jevgeņija Lugiņina、Vitālijs Rjabovs、Sergey Belyakov、Māris Turks
DOI:10.1016/j.carres.2011.12.020
日期:2012.3
Moffatt dehydration of 1,2:5,6-di-O-isopropylidene-α-d-glucofuranose derived nitro alcohols with a mixture of Ac(2)O and DMSO was reinvestigated. It was discovered that, regardless of the absolute configuration at C(3) of the sugar moiety, the dehydration provided exclusively the (3Z)-nitromethylene derivative. Slight modification of the workup conditions (pH⩾8, temperature: 25-30°C) gave exclusively
重新研究了1,2:5,6-二-O-异亚丙基-α-d-呋喃呋喃糖衍生的硝基醇与Ac(2)O和DMSO的混合物的莫夫特脱水现象。发现,无论糖部分的C(3)处的绝对构型如何,脱水仅提供(3Z)-硝基亚甲基衍生物。稍微修改后处理条件(pH⩾8,温度:25-30°C)仅得到一种新产物,(3S)-3-deoxy-3-methylthio-3-C-nitromethyl-1,2:5,6 -二-O-异亚丙基-α-d-呋喃葡萄糖。后者是通过在环境温度或略微升高的温度下在碱性水溶液中进行后处理的过程中,将硫代甲基化阴离子的迈克尔加成至先前报道的硝基亚甲基衍生物而获得的。